问题补充：
(·高考安徽卷)I to my cousin’s birthday party last night，but I was not available.
A. went
B. had gone
C. would go
D. would have gone
答案：
A. went
B. had gone
C. would go
(答案→)D. would have gone
解析：选D。句意：昨晚我本应该去参加我堂妹的生日聚会，但我没有空。I was not available表示的是过去的真实情况，为一含蓄条件，相当于if I had been available(如果我有空的话)，此处为与过去情况相反的虚拟语气，主句应使用 “would/might/could/should＋have done”结构，故选D项。本题易受was和last night的影响而错选A项或C项，但本题为虚拟语气，而非陈述语气。考生若没有弄清楚虚拟条件句的主句和从句中谓语动词结构的不同，就可能错选B项。
